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 * furnished to do so, subject to the following conditions:
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 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
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package org.spongepowered.common.mixin.optimization.mcp.world.server;

import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.common.bridge.world.WorldBridge;
import org.spongepowered.common.bridge.world.level.chunk.ActiveChunkReferantBridge;
import org.spongepowered.common.bridge.world.level.chunk.LevelChunkBridge;
import org.spongepowered.common.event.tracking.PhaseTracker;
import org.spongepowered.common.mixin.optimization.mcp.world.level.LevelReaderMixin_Optimization_Collision;

import java.util.Optional;
import java.util.stream.Stream;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.phys.AABB;

@Mixin(value = ServerLevel.class, priority = 1500)
public abstract class ServerWorldMixin_Optimization_Collision implements LevelReaderMixin_Optimization_Collision {

    @Override
    public Stream<BlockState> getBlockStatesIfLoaded(final AABB aabb) {
        if (((WorldBridge) this).bridge$isFake()) {
            return LevelReaderMixin_Optimization_Collision.super.getBlockStatesIfLoaded(aabb);
        }
        final Optional<ActiveChunkReferantBridge> source = PhaseTracker.getInstance().getPhaseContext().getSource(Entity.class)
            .map(entity -> (ActiveChunkReferantBridge) entity);
        if (source.isPresent()) {
            final LevelChunkBridge activeChunk = source.get().bridge$getActiveChunk();
            if (activeChunk == null || activeChunk.bridge$isQueuedForUnload() || !activeChunk.bridge$areNeighborsLoaded()) {
                return Stream.empty();
            }
        }
        return LevelReaderMixin_Optimization_Collision.super.getBlockStatesIfLoaded(aabb);
    }
}
